surok
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that is really cool what an awesome car it must be. 200kw 3sge with NA like powercurve..
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mr_ken
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288nm ? are you sure about that figure.
considering a STOCK gen 2 3sgte makes 165kw (whywheel)and 304nm..... i would expect yours to have a higher toque output than 288nm (power and torque are related).... are you sure 288nm is corect?
not saying it in a critical way, but saying it in disbelief.
anyways AWESOME engine and car, i would love to own this, would be super fun !
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MANDALAY
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Here is the Dyno. FYI 7,300 RPM injectors 75 % duty Intercooler is very effecient only 8 degrees over ambient temp Rotrex oil even with all the power runs only hit 51 degrees celcius. Comment was that there is still a lot adjustment available in the timing and the low temps that i could have run a higher compression ratio than the 8.9 that i built. But its very safe tune and just to be sure extra fuel is added at 7,300 rpm. Thats the reason for the curve downwards  Also the second dyno is compared to an import MR2 Turbo. Look at the difference between the Rotrex SC and a Turbo MR2 
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surok
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why is your compression ratio so low? you could run 20psi through that thing..
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MANDALAY
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quote:
Originally posted by mr_ken
288nm ? are you sure about that figure.
considering a STOCK gen 2 3sgte makes 165kw (whywheel)and 304nm..... i would expect yours to have a higher toque output than 288nm (power and torque are related).... are you sure 288nm is corect?
not saying it in a critical way, but saying it in disbelief.
anyways AWESOME engine and car, i would love to own this, would be super fun !
Ive posted a comparison. Do you have any plots of a turbo MR2
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kameleon
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comparing a high ve engine like yours with the latest in aerodynamics supercharger is unfair against a standard built in the early 90's mr2 turbo.
nice figure, should be reliable and last you years.
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MANDALAY
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quote:
Originally posted by surok
why is your compression ratio so low? you could run 20psi through that thing..
Builder got instructions from me to be safe. We settled at 8.9 : 1 There is enough adjustmentleft in timing to go to 10 - 10.5 . I have another engine for the future but this ia awsome , fast and is just like a N/A so i dont need anymore
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MANDALAY
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quote:
Originally posted by kameleon
comparing a high ve engine like yours with the latest in aerodynamics supercharger is unfair against a standard built in the early 90's mr2 turbo.
nice figure, should be reliable and last you years.
But correct me if im wrong. Evo , WRX as stock are under 205 at the wheels ? This is more like around 240 kws at the flywheel , m3 teritory and 500 kgs less weight ?
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kameleon
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your not wrong but you certainly did not mention what you typed above in the dyno sheet? i thought thats what we were comparing?
build a beams Lotus 7 if you want power to weight! but once again we were comparing 2 engines...
Shame you were not at haunted hills. Will us Melbourne locals ever see this car???
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MANDALAY
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yep, once its all together. Just remember Sunny day / beach !
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MANDALAY
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The comparison plot was only to show the difference in the way the power is applied by different FI methods.
I want a N/A because thats what i like. After owning 2 turbos in my life the Rotrex really still is a N/A the way the power is applied, but makes it feel as if there are a couple more pistons.
Yes its not fair to compare cars as the weights are different but the engine alone its more than the other stock 4 cylinder turbos.
Then factor in lighter car and it would be faster, but then factor in a modified 4 cylinder turbo and it would probably be more.
No point in chasing numbers. There will always be someone , faster, dearer, better etc.
This is a street car, plenty fast and most of all drives like a N/A
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stuka
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your max torque is more like 470 NM rather than 288 NM. Ive never looked at a boost curve for a supercharger before, very different from a turbo in the delivery. the comparison dyno sheet is a good idea
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kameleon
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artymr2
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Wow, thats a very linear power curve, nice work!!
Its interesting how your setup seems to be more efficient than the turbo, ie it generally makes more torque (and hence power) at smaller boost levels.
On a side note, I thought you cant get torque figures (at the engine) on a chassis dyno, as its just measuring the torque at the wheels? I guess you could work it back if you knew the exact gear ratios and tyre diameters.
Cheers
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cogs
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The boost curve on that turbo is terrible too, it hits 15psi then slowly drops back to 11psi as the revs build. If it held 15psi it'd be a much better comparison, and the turbo would probably end up with more area under the torque curve.
You're right Arty, the flywheel torque can only be calculated with knowledge of ratios, tyre rolling radius, and linear force measured by the dyno. The only torque the dyno can report directly in the absence of this info is the braking torque it's applying to its rollers.
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